The PHYSSYS ontology is an ontology that only performs ontology projections. It includes the component, process and EngMath ontologies and relates them to each other. Figure 9 shows the relations between instantiated views on a physical system. Basically, it defines that components are the carriers of physical processes that can be mathematically described with physical quantities and mathematical relations.

**Figure 9:**
Interdependencies between the component, process and mathematical
ontologies. Roughly it states that a component is the carrier of
physical processes that are described by mathematics.

Fri Sep 27 13:28:43 MET DST 1996